jeffbeaux83

Thanks, i think the code was a 420, maybe ch420 i can't exactly remember but it said it was the cat, but i was wondering about the o2, would it be the sensor right behind the cat? thanks again

I have a 2000 corolla CE and recently I dropped from about 40mpg highway to around 32mpg. The car was reading a check engine code and I checked it with a diagnostic computer that said it was a catalytic converter code that had come up twice. Could this be a problem with an o2 sensor or would replacing the catalytic converter bring my mpg's back up. I believe it is not the converter because the car only has 130k on it and this loss of mpg was kind of a sudden thing that coincided with the check engine light coming on. Thanks for any help. Jeff.

hey, i have a 2000 corolla CE with a 5-speed transmission. when i put it in fourth gear it pops out randomly. i'm sure i put it all the way into gear and i'll be driving and it will just shoot out of gear. Does anyone know what could be causing this to happen. thanks, Jeff.

Thanks a lot for the tips, i was wondering if exhaust would improve the mileage, i know that on some newer models a less restrictive exhaust will actually hurt mpg because of the back-pressure. what is a "SRI"? thanks again.

I just bought a 2000 Corolla 5-speed and it is getting about 35mpg on the highway. what are some ways i can increase the gas mileage? i was thinking about a k&n stock air filter replacement. are there any other good tips? thanks. i'm new to this forum so i'm not sure how it works.